发布求助
文献互助 智能选刊 最新文献

IEEE AFRICON. 6th Africon Conference in Africa,最新文献

筛选
英文 中文
Reactance of electrically short radio frequency coaxial probes 电短射频同轴探头的电抗
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159968
P. Kwinana, J. Cloete
{"title":"Reactance of electrically short radio frequency coaxial probes","authors":"P. Kwinana, J. Cloete","doi":"10.1109/AFRCON.2002.1159968","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159968","url":null,"abstract":"An experimental technique is presented to determine the aperture reactance of a short radio frequency (RF) coaxial probe. The method is based on the inversion of the measured reflection coefficient at the probe's input port. The work was done at 500 MHz using an HP8510C network analyzer and high quality calibration standards. For precise inversion the attenuation and phase constants of the coaxial line must be determined with high accuracy. To a good approximation the measured probe capacitance was found to increase linearly with length from the value for a flush probe. This allows the CW capacitance of a short probe, with length up to 1/10 the free-space wavelength, to be modeled using a simple two-term model. Bare and insulated probes, both shielded and unshielded, were studied.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126183308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Changes in course presentation to accommodate the "information age" and outcomes based requirements 改变课程呈现以适应“信息时代”和基于结果的要求
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146874
G. Gibbon
{"title":"Changes in course presentation to accommodate the \"information age\" and outcomes based requirements","authors":"G. Gibbon","doi":"10.1109/AFRCON.2002.1146874","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146874","url":null,"abstract":"The \"traditional\" lecturing style, of presenting students with information during lectures and examining their ability to grasp and retain this information, no longer meets the outcomes for engineering graduates as required by the Engineering Council of South Africa. As a result of the outcomes based requirement and the easy access to electronic information the style of teaching, in the final Electronics and Measurement Systems courses, has been changed to a \"workshop\" styled system design with the responsibility left to the students to obtain the content information. Initial findings indicate that, although there was initially extreme resistance by the students at the start of the course, their self-confidence improved with better results for the particular course and the design course that it supports.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123749246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Technological innovation in the South African automotive industry 南非汽车工业的技术创新
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146887
M. Pretorius
{"title":"Technological innovation in the South African automotive industry","authors":"M. Pretorius","doi":"10.1109/AFRCON.2002.1146887","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146887","url":null,"abstract":"This paper discusses the automotive industry cluster that can be profiled as a Technology Colony and how a strategy for building technological capability can be determined. The industrial network a firm operates in influences its technological capability. Networks differ in dynamics because of the differences in actors and the nature of interfacing between them. A Technology Colony can be defined as a concentration of technological based activities in the later phases of product lifecycles, without the necessary supportive technological based activities in the earlier phases of the lifecycles. In industrial clusters where the majority of the firms exhibit this type of technological profile, the network dynamics are different. In such cases the building of technological capability needs to be planned according to these characteristics.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114289765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A posteriori error estimation results for the FEM analysis of a waveguide filter 对波导滤波器的有限元分析结果进行了后验误差估计
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159966
M. A. Botha, D. Davidson
{"title":"A posteriori error estimation results for the FEM analysis of a waveguide filter","authors":"M. A. Botha, D. Davidson","doi":"10.1109/AFRCON.2002.1159966","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159966","url":null,"abstract":"The use of an explicit, residual-based, a posteriori error indicator for directing a single-level p-refinement of the finite element method analysis of a waveguide filter is investigated. Hierarchical, curl-conforming elements of various orders are employed. It is shown that substantial improvements upon uniform element polynomial order discretizations can be obtained in terms of accuracy versus number of degrees of freedom.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"3 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129780235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Moment-method analysis of waveguide diaphragms of arbitrary shape 任意形状波导膜片的矩量法分析
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159961
D.B. Konditi, S. Sinha
{"title":"Moment-method analysis of waveguide diaphragms of arbitrary shape","authors":"D.B. Konditi, S. Sinha","doi":"10.1109/AFRCON.2002.1159961","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159961","url":null,"abstract":"This paper presents a moment-method analysis of waveguide diaphragms/irises of arbitrary shape. The \"generalised network formulation\" for aperture problems has been used for formulating the problem in terms of an operator equation. Triangular patch modelling, using suitably defined basis functions, has been used to solve the operator equation. Various pertinent parameters have been evaluated and numerical results validated. The validated results are found to be in good agreement with the published data. Thereafter, data generated for new problems have also been given.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129871451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Four-quadrant current-regulated DC servo drive using a fuzzy logic-based controller 四象限直流稳流伺服驱动采用基于模糊逻辑的控制器
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1159999
M. I. Jahmeerbacus, K. Soyjaudah, C. Bhurtun, M. Oolun
{"title":"Four-quadrant current-regulated DC servo drive using a fuzzy logic-based controller","authors":"M. I. Jahmeerbacus, K. Soyjaudah, C. Bhurtun, M. Oolun","doi":"10.1109/AFRCON.2002.1159999","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1159999","url":null,"abstract":"DC servo drives normally employ an internal current loop as well as a speed control loop requiring the use of a speed transducer. This paper presents a fuzzy logic controlled DC servo drive without the need for mechanical speed sensors. Speed estimation is performed from measurements of the input current and voltage to the motor. The latter is driven by a current-regulated voltage source DC-DC converter capable of operating in all four quadrants of the torque-speed plane. The fuzzy controller uses the calculated rotor speed to produce the armature current command necessary for matching the reference speed profile. The proposed system is shown to track the dynamic input speed settings and to reject step load disturbances with largely reduced settling times and steady state errors.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128456761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An implementation of generalised convolution for image processing 用于图像处理的广义卷积的实现
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146854
S.P. Levitt, B. Dwolatzky
{"title":"An implementation of generalised convolution for image processing","authors":"S.P. Levitt, B. Dwolatzky","doi":"10.1109/AFRCON.2002.1146854","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146854","url":null,"abstract":"Generalised convolution is a ubiquitous image processing operation in which a local operator is applied to an image in order to transform it in some manner. We present an extensible and flexible C++ implementation of generalised convolution in the image domain that is based on the Strategy design pattern. Our implementation facilitates the coding of different local operators.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126449832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Active noise control in real-time using a TMS320C50 DSP system board 主动噪声实时控制采用TMS320C50 DSP系统板
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146815
M. Oolun, C. Bhurtun, K. Soyjaudah, M.I. Jahmeerbaccus
{"title":"Active noise control in real-time using a TMS320C50 DSP system board","authors":"M. Oolun, C. Bhurtun, K. Soyjaudah, M.I. Jahmeerbaccus","doi":"10.1109/AFRCON.2002.1146815","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146815","url":null,"abstract":"This paper presents a real-time active noise controller system, based around a TMS320C50 DSP system board. The proposed technique consists of identifying the noisy space medium where the cancellation needs to be effected using a coded interrogation technique, and subsequently cancelling the noise using a simple, yet robust prediction strategy. Software coding and implementation has been achieved, with a signal-to-noise ratio improvement of up to 16 dB. The time taken to achieve this performance is about 32 s, for a wideband noise over the range 50 to 200 Hz. Once the system has learned the noise characteristics of the medium, it offers good tracking characteristics in cancelling the noise thereafter.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122015933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Increasing value of projects by leveraging limited capacity through the application of the Theory of Constraints 通过约束理论的应用，利用有限的能力来增加项目的价值
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146888
P. J. Viljoen
{"title":"Increasing value of projects by leveraging limited capacity through the application of the Theory of Constraints","authors":"P. J. Viljoen","doi":"10.1109/AFRCON.2002.1146888","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146888","url":null,"abstract":"This paper introduces the concepts of the Theory of Constraints as developed by Dr. E. M. Goldratt and others. When applied to a portfolio of projects, the value that an organisation realises from successful delivery can be maximised. A new value metric is introduced that effectively accounts for the flow of money in different time periods. An approach to portfolio management that strives for maximising organisation performance, given limited organisational capacity, is also introduced. Critical Chain project scheduling and synchronising projects around the schedule of a heavily loaded (drum) resource are used as the methodology of finite capacity management that enables leveraging value with scarce resources. A new set of buffers is introduced to enable the integration of portfolio management and Critical Chain scheduling.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133812542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Xpertfinder - message analysis for the recommendation of contact persons within defined topics Xpertfinder -消息分析的建议联系人在定义的主题
IEEE AFRICON. 6th Africon Conference in Africa, Pub Date : 2002-10-02 DOI: 10.1109/AFRCON.2002.1146803
F. Heeren, W. Sihn
{"title":"Xpertfinder - message analysis for the recommendation of contact persons within defined topics","authors":"F. Heeren, W. Sihn","doi":"10.1109/AFRCON.2002.1146803","DOIUrl":"https://doi.org/10.1109/AFRCON.2002.1146803","url":null,"abstract":"Personal acquaintance represents an essential basis for the exchange of information between employees. Recommendation of contact persons is a method that fosters the build-up of acquaintanceship in order to support the exchange of information. The subject of the present paper is a new recommendation technique, which automatically and continuously detects contact persons within relevant topics and represents them anonymously. For the detection of contact persons, various indicators are drawn up, e.g. authorship for the source of textual information and addresses for contact information. The emphasis of the paper is on the description of the data processing concept using Latent Semantic Analysis as well as the effectiveness of that method for document classification.","PeriodicalId":185871,"journal":{"name":"IEEE AFRICON. 6th Africon Conference in Africa,","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114864353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信
小红书